Chuck for a valve grinder



July 14, 1964 R. w. MURRAY CHUCK FOR A VALVE GRINDER Filed July 13, 1961 INVENTOR. POBERT M Mummy BY 2 g z A rwa United States. Patent 3,140,569 CHUCK FOR A VALVE GRINDER Robert W. Murray, 557 53%. Ave. NE., Minneapolis, Minn., assignor of twenty-five percent to James A. Fridland, Hennepin County, Minn.

Filed July 13, 1961, Ser. No. 123,895 2 Claims. (Cl. 51236) This invention relates to a machine for grinding valves, and more particularly to a machine of simple construction wherein said valves are readily positioned for grinding.

In prior art devices for grinding valves and refacing valves, elaborate chuck means are provided and consequently such devices are costly. My invention, on the other hand, is of simple construction and of a cost that makes them available for use in small shops and garages.

It is, therefore, an object of my invention to provide a simplified valve grinding machine wherein a valve may be ground quickly and accurately.

It is another object of my invention to provide a simplified holding meansfor-a valve to be ground which permits facile rotation andremoval of said valve.

It is a further object of-my invention to provide means for concurrent, simultaneous positioning of a valve to be ground.

It is another object of my invention to provide a simplified holding and release means for a valve to be ground.

It is a further object of my invention to provide a valve grinding machine having simplified means for grinding and dressing, which includes a power-take-off means for performing work functions.

It is another object of my invention to provide a wheel dressing hand positionable for dressing a grinding wheel or positioning a valve to be ground.

It is a further object of my invention to provide a chuck means having a plurality of roller members for readily positioning and holding a valve to be ground.

These and other objects and advantages of this invention will more fully appear from the following description made in connection with the accompanying drawings, wherein like reference characters refer to the same or similar parts throughout the views, and in which:

FIG. 1 is a perspective View of my valve grinding machine;

FIG. 2 is a sectional plan view taken at 22 of FIG. 1;

FIG. 3 is a sectional elevation taken at 33 of FIG. 1; and

FIG. 4 is a sectional view taken at 44 of FIG. 1.

Reference is made to FIG. 1 wherein the valve grinding machine has a metal base 11. Integral with said base is a machined portion 12 on which is slidably mounted chuck assembly 13. Secured to base 11 by bolts 14 is a mounting plate 15 on which is mounted motor means 16 and dressing arm assembly 17. Motor means 16 turns shaft 18 on which grinder wheel 19 is mounted and secured by collar 20. Said motor means 16 also drives power-take-off cable 21 to which rotatable attachments may be connected.

A guard 22 secured to motor means 16 covers a portion of the periphery of grinder wheel 19. A clip means 23 mounted on said guard holds coolant discharge pipe 24 for directing coolant on a valve to be ground. Pipe 24 is connected to hose 25 for receiving the coolant from coolant pump 26.

Dressing arm assembly 17 adjacent grinder wheel 19 has a dressing arm 27 pivotally mounted on pin 28, supported in pivot supports 29 integral with plate 15. The arm 27 includes a head portion 30 provided with an angular recess 31. Mounted in head portion 30 is a diamond dressing means 32 for dressing said wheel 19 when the arm 27 is pivoted toward and adjacent said wheel. The angular recess 31 is used for holding valves for the grinding of their end portions when the arm 27 is pivoted adjacent said wheel 19.

Thus the dressing arm assembly 17 and motor means 16 with grinder wheel 19 are mounted for co-action on plate 15. To grind a valve 33, the valve must be held and positioned relative to grinder wheel 19. The holding and positioning of valve 33 is done by chuck assembly 13 slidably mounted on machined portion 12 of base 11. The chuck assembly 13 is slidably secured to portion 12 as by bolts 34 extending through elongated slots 35 of chuck assembly base 36. Thus chuck assembly 13 can be positioned longitudinally of the base 11 to the degree allowed by the etxent of elongated slots 35. To facilitate the sliding movement of assembly 13 and to place such movement under control of an operator, hand crank 37 is provided having a threaded portion 38 engageable with crank block 39 integral with chuck assembly base 36. A bearing block 40 supports crank 37 in bearing portion 41. As block 40 is stationary and integral with base 11, turning movement of crank 37 is imparted to threaded portion 38 to move chuck assembly 13 toward or away from the bearing block 40. Thus a valve 33 mounted in chuck assembly 13, to be described in detail hereinafter, can be positioned relative to grinding wheel 19 by the turning of crank 37.

To hold a valve 33 in chuck assembly 13, a roller support bracket 42 is slidably mounted in guide slot 43 of assembly base 36 wherein said bracket 42 is urged by springs 44 toward a roller 45 supported on chuck assembly base 36 by a bearing mount 46. Mounted on bracket 42 are a pair of rollers 47-47A and 4848A which contact the stem of valve 33 and hold the valve against roller 45 by the urging of springs 44. Thus the valve 33 may be said to be in engagement with rollers 45, 4747A and 4848A, and of such extent that the rotation of roller 45, as by crank 49, causes the valve 33 to be rotated so that various portions of the valve head may be ground by the grinder wheel 19.

In my preferred embodiment, the roller 45 is connected to crank 49 by shaft 50 so that one revolution of the crank produces 20 revolutions of the valve 33. Thus an operator has manual control of both the longitudinal position and rotational position of valve 33 by crank arms 37 and 49 respectively and can perform the valve grinding simply and with accuracy.

In my preferred embodiment, rollers 47A and 48A have slightly larger diameters, on the order of .015" larger, than the diameters of rollers 47 and 48. With the larger rollers 47A and 48A, the valve 33 is urged during rotation thereof against a stop 54. When the valve 33 rests against stop 54, the longitudinal positioning of the valve during grinding is accomplished by crank 37 as hereinabove described. The enlarged rollers 47A and 48A thus, when engaged with valve 33, allow the valve to position during rotation in a predetermined direction against stop 54.

It will be apparent that the rollers 47 and 47a may be mounted on a single shaft which constitutes one axis of rotation for both of said rollers and that the rollers 48 and 48a may be mounted on another shaft which constitutes the axis of rotation for these rollers. It should be pointed out that rather than providing rollers 47a and 48a with slightly larger diameters than the rollers 47 and 48, the two shafts could be arranged to converge slightly toward the ends thereof adjacent the rollers 47 and 48 in order to produce the same retaining action of the valve 33 against the stop 54.

To release the valve 33, or for insertion, an eccentric 51 is rotated on pin 52 by arm 53 so that the roller bracket 42 and rollers 47 and 48 are moved away from roller 45, thus allowing facile removal or insertion of valve 33. When the eccentric 51 is turned in the oppodo site direction, springs 44 once again urge bracket 42 and rollers 47 and 48 toward roller 45.

Thus I have described my valve grinding machine which allows for the easy insertion and removal of a valve, and provides for control of the valve during the grinding operation.

The arrangement is shown to be compact as mounted on base 11, and the removal of parts and assemblies is simple for ease in maintenance of the valve grinding machine. Dressing the wheel is also facilitated by the hereinabove described dressing arm assembly.

It will, of course, be understood that various changes may be made in the form, details, arrangements and proportion of parts without departing from the scope of my invention, which generally stated consists in the matter set forth in the appended claims.

What is claimed is:

1. A chuck for holding a valve against a grinding wheel including in combination a movable chuck base with means for positively moving the same relative to such grinding wheel, stop means mounted on said base for positioning a valve thereagainst, a pair of rotatable roller means mounted on said movable base, a first of said roller means having one end of larger diameter than the other end, said larger end arranged in closely-spaced relation to said stop, means for shifting the axis of said first roller to position the peripheral surface of the roller ends in parallel relation to the surface of the second roller means to hold the valve therebetween and urge the valve against said stop upon rotation thereof, means for urging said first roller means toward said second roller end means for moving said roller means apart to facilitate removal and insertion of the valve therebetween.

2. A chuck for holding a valve against a grinding wheel including in combination, a movable chuck base with means for positively moving the same relative to such grinding wheel, a pair of roller means mounted on said movable base in generally opposed relation with means for urging one means toward the other to grip a valve therebetween, stop means mounted on said base for positioning said valve thereon, means for urging said valve toward said stop to maintain contact therewith, means for rotating the valve while the same is being held between said roller means, means for moving said roller means apart to facilitate removal and insertion of a valve therebetween, the means for maintaining said valve against said stop comprising means for positioning certain peripheral portions of said roller means in closer association to each other than other portions thereof, and portions of one roller means having a larger diameter than the other portion thereof to position the periphery of the larger portion in closer association to the other roller means than the first mentioned portion.

References Cited in the file of this patent UNITED STATES PATENTS 1,452,508 Hervig Apr. 24, 1923 1,467,023 Willson Sept. 4, 1923 1,702,267 Miller Feb. 19, 1929 1,938,764 Haas Dec. 12, 1933 2,221,918 Hall et al. Nov. 19, 1940 2,411,972 Melin Dec. 3, 1946 2,741,074 Kopczynski Apr. 10, 1956 

1. A CHUCK FOR HOLDING A VALVE AGAINST A GRINDING WHEEL INCLUDING IN COMBINATION A MOVABLE CHUCK BASE WITH MEANS FOR POSITIVELY MOVING THE SAME RELATIVE TO SUCH GRINDING WHEEL, STOP MEANS MOUNTED ON SAID BASE FOR POSITIONING A VALVE THEREAGAINST, A PAIR OF ROTATABLE ROLLER MEANS MOUNTED ON SAID MOVABLE BASE, A FIRST OF SAID ROLLER MEANS HAVING ONE END OF LARGER DIAMETER THAN THE OTHER END, SAID LARGER END ARRANGED IN CLOSELY-SPACED RELATION TO SAID STOP, MEANS FOR SHIFTING THE AXIS OF SAID FIRST ROLLER TO POSITION THE PERIPHERAL SURFACE OF THE ROLLER ENDS IN PARALLEL RELATION TO THE SURFACE OF THE SECOND ROLLER MEANS TO HOLD THE VALVE THEREBETWEEN AND URGE THE VALVE AGAINST SAID STOP UPON ROTATION THEREOF, MEANS FOR URGING SAID FIRST ROLLER MEANS TOWARD SAID SECOND ROLLER END MEANS FOR MOVING SAID ROLLER MEANS APART TO FACILITATE REMOVAL AND INSERTION OF THE VALVE THEREBETWEEN. 